These headphones are 1/3rd off in store at Sainsburys in Ely, Cambridgeshire. You can get them delivered from £1 with groceries. Their WWW says that the promotion is "not in all stores", and expires on January 27th.
They are £12.99 at Amazon and £13.97 at Argos
They are either Black or White. The box is nice and easy to open. The plug is 3.5mm with a 6.3mm adaptor plug.
The reviews seem OK for £10 headphones.